The U.S. Supreme Court decided many years ago, in a case called Pennsylvania v. Mimms, that an officer may order someone who he has stopped for a traffic violation to get out of the car. Thus, you do not have a choice in the matter. It does not matter that the weather is unpleasant or that the officer does not have a clear reason for asking you to get out. When the officer asks you to “please step out of your car,” you have to do it. As mentioned in Part VIII of this series, these sorts of “requests” can be confusing. A polite officer will often ask things like, “May I please see your license? Would you please step out of your car? Would you please pop your trunk? Would you please open your glove-box so I can take a look?” All of these sound like requests. But the first two are orders which may not be refused while the last two are fully optional requests which may, and should, be refused. The only way to tell the difference is to know your rights. Thus, as the CORRECT and BEST answers recognize, you must get out of the car when the officer asks you to.